0158101 soil Idalker I - dates Archi tects
April 11, 1980
page 7
A thin leveling course, at leaSL six inches in compacted thickness,.
is recommended beneath all s-l-ab-on-grade. Coarse material should
be avoided directly beneath the slab -on -grade to lililit potential
stress concentrations within the slab.
General- engineered structural -fill may be'composed of.pit-run,sand
and gravel during the wet season.
Free -drainage material is required for the*basement drainage system.
Pavement structures must be underlain by.a design thickness of dense
ality crushed rock (one inch minus)
High ality
granular sub -base material. qur.
is for the upper layer of the sub- base,
recoiiiiiiended
Random landscape fill material may be obtained on the site with
little regard to engineering quality.
7.11. COAMPACTION STANDARD
Structural fill should be compacted in layers not exceeding eight
d ry, density. of 95 percent
inches in compacted thickness to a uniform
1aximum Proctor of 1 I tor dry.density (ASTM D-1557). Over -compaction
should be avoided within three feet from a wall, Which could
Random landscape
cause excessively high lateral wall pressures.
fill, should be compacted to a modest dry density (about 90-percent
Proctor dry density to prevent excessive settlement
of Maximum Proc I
which could impede surface drainage).
8. CLOSURE
The analysis and recommendations are formulated, based on the site.
the
It
condition as they presently exist, and further assume that
soil conditions encountered in the test pit locations
those conditions throughout the site. if, during
are representative of
construction., the subsurface conditions are different from 'those
encountered in this investigation, we should be notified so that we
our recommendations
can review these conditions and reconsider
The report is prepared for the exclusive use of
wherever necessary.
the architect, contractor, and engineers for specific aiiplication
soil and foundation
on this project in accordance with generally accepted
engineering practice. No warrenty, expressed or implied, is made.
The footing bearing surface and the base of excavation should be
the
re --examined by an experienced geotechnical engineer, as soon as
excavations are in progress and completed.